Threading device.



C. F. SGHULTIS.

THREADING DEVICE.

APPLICATION FILED JAN.19,1912. LELUSQYSEBD Patented Aug. 25, 1914.

2 SHEBTSSHEET 2.

2/2/25'2755555 Mfr di. v /4m d ri THFPUEADING DEVICE.

ruiirnnr ,FFICE.

sonorars, or CLEVELAND, onto, aserenon, BY DIRECT AND MEs stem/rams, arecrimes-urn amt, or ctnvernnn, onro.

- Application filed .Tanuary 19, 15512. Serial No. 672,094.

on r or tools one, whilc applicable to handopc. the l,-'Ofllll'l6.l?.i.shown herein is of the power-operated type, wherein the threading deviceor tool is mounted a large machine, as a turret-lathe or drill press;

The general objects of the invention are to provide a device of thiskind with improved automatically operating means whereby the dies threadcutters are not only automatically opened or separated when a cut of apredetermined length has been made, but the cutting faces are maintainedin substantially parallel relation during such separation.

A still further object of the invention is to provide a tool ofthis'liind with particularly 'cfiicicnt means whereby threads of yaryingdepth may be conveniently and etficiently cut, the, change in depth ofout being accoinplisl'ied by an extremely simple adjusting operation;also to provide an efficient means for automatically closing or bringingto cuttinggposition the threading or die cutting members after they havebeen automatically separated; also to provide a convenient and eliicientdriving connection between the threading dcvlce as a whole and the shanktherefor, which connection will permit of longitudinal movement betweenthese parts; also to provldc improved means for securing andad1ust1ngthc cutting members or dies in place.

A furtl'ier and general. ob eCt of the am venti'on is tov provide annnproved and simplifi d construction for automaticallyope mg thethreading device.

Still further and more gencrallystated,

the invention is comprised by and within the combinations of elementsembodiedin'the claims hereto annexed and illustrated in the drawingsforming part hereof wherein;

Figure 1 represents a longitudinal sec tionai view taken through adevice condevicos or tools,

of Fig. 2; Fig. 2 represents an elevation of the device shown in Fig. 1,part of the outer I casing being brokenaway. Fig. 3 represents asectional detail of-a part of the dc-' vice shown in Fig. 1,illustrating the mannor in which the cutting members or dies are. openedor separated. .Fig. 4 is a somewhat diagrannnatic View of the adjustingring for varying the depth of the threads cut. Fig. IS a sectional viewcorresponding to the line 5-5 of Fig. l, certain parts being-showninelevation. Fig. is a front elevation of the threadlng device or tool,parts being broken away; Flg. 7 -1S a-sectional view corresponding tothe line 7.-7 of Fig. 2, and,

Scr. No. 620,102 and, as illustrated, is adapted to'be mounted in amachine in which either the tool or the work is rotated.

Describing by reference characters the various parts illustrated herein,1 denotes the shank of a tool, said shank supporting a generallycylindrical head 2, which is connectcd to the shank by means of aplurality of pins 3, the bodies whereof are preferablycylindrical andare mounted in correspond ingly shaped radial guides in the tool body,said pins having reduced ends 4 which project into slots 5 in the bodyof the shank,

said slots being of considerably greater length than the projections 4,whereby the head is connected with the shank in such structed inaccordance with my invention, the SGCtlOIl corresponding to the line 1-1Patented Aug. 25, 1914..

manner as to prevent rotary movement therebetween but permit a relativelongitu dinal movement therebetween.

hereinafter.

The pur pose of this construction will beexplained The shank is providedwith a central bore 6 inwhich there is mounted a pin'i, said'pin.

being adjustably secured in said bore-by means of a screw 8 mounted inthe shank and vhaving a flattened inner endadapted to bear against aninclined surface 9 with which said pin is provided. The pin 7 projectsinto the cylindrical chamber. 9. of the tool and is there rovided witha-T-head 10.

ios

The cylin rical head of the tool orstoc'k is provided with a pair ofradial slots 11 projecting thereinto from the outer surface of the headand extending substantially to the front or die-supporting end of thehead. In each slot a lever 12 is pivotally supported intermediate of itsends by means of a pin 13. The rear end of each lever is provided withaprojection 14 and the front end with a reduced neck 15 having a roundedhead 16 thereon. The head projects into a cylindrical opening formed inthe T-shaped guide extension 1-7 of a die-carrier 18, the front portionof the die carrier being preferably in the shape of a semi-cylindricalring which "projects in front of the head 2 of the stock.

For the purpose of providing for the wear between the head 16 and thecooperating surface of the die carrier, a liner tube 19 is fitted intothe cylindrical aperture provided in guide extension 17, which liner canbe conveniently removed and cheaply replaced by another when the partsbecome worn. At the rear of the pivot 13, and preferably near its rearend, each lever is provided with a recess 20. In this recess there isinsertcda spiral spring 21 hearing at one end 'itgillllst the bottom ofthe recessand at its opposite end against. the head 22 of a pin,

said head preferably being rounded, as shown. Surrounding the body ofthe die stock and retaining the levers 12, pins 22 andpins 3 in place isa cylindrical casing 23, said casing being conveniently secured iuplaceby screws For the purpose of preventing the rear ends of the levers 12from being thrown inwardly by the springs 21 and thus separating thedie-carrying nuunbers, a ring 24 is provided which is nm-nially engagedby the rear ends of these levers This ring is shown as threaded uponthe-forward end of a cylindrical collar 25 which is rotatably mountedupon a reduced portion 26 of the shank 1 and is 'provided with anoutwardly projecting flange 27 at its rearv end, which flangesubstantially covers the rear end of the head 2. An annular space 28 isprovided in the head 2 immediately surrounding the collar 25 and in-this space there is located a heavy coiled spring 29, one end of whichbears against the ring 24, and the other against an annular plate 30,which is secured to the head 2,

being located within a recess in the rear.

end of the head and projecting radially into substantial contact withthe collar 25, thereby, formin'g an abutment for the opposite end of thespring 29. In front of the reduced portion 26, the shank 1 is providedwith a threaded portion 31 to which there is applied a ring 32, saidring. being located immediately in front of the ring 24 and being ofmaterially less external diameter than the latter ring.

The ring 32 is seated in a recess provided Within the head 2, and formsan abutment for the front end of the collar 25.

The casing 23 terminates considerably short of the front of the head 2and the front end of said head is provided with an outwardly projectingflange 33 between which and the front end of the casing 23 there isprovided an annular recess for the reception of a ring 34, said ringbeing provided with a recess for the flange 33 and with an angularrecess 35 located in front of the recess 33 and formed between anoutwardly projecting shoulder 36 and a forwardly projecting shoulder 37.In the last recess, each die carrier 18 is provided with asemi-cylindrical extension or ring 38, intermediate be.- tween the frontof said carrier and the guide extension 17 thereof, and each ringsection 38 is provided with bore 39, preferabl located equidistant fromthe ends thereo there being a pin 40 mounted in each bore and having ahead 41, which is'substantially wedge-shaped, in order to provide a pairof cam operating faces 42. These operating faces are adapted to beengaged by rollers 43 mounted on pins 44 carried by the collar 34 andprojecting into the space 35. 'It will be apparent that, by rotating thecollar 34 relative to the body or head of the tool, the die carriers maybe forced inwardly as the rollers 43 ride up either of the inclinedsurfaces 42. The parts are so proportioned that, when the rollers are onthe highest points of the heads 41, the die carriers will each be in itsinnermost adjusted position.

The dies and die-carriers which I. preferably employ are of the typeemployed in my application referred to hereinbefore. The dies are shownat 45 and are generally semicylindrical in shape, each having thecutters 46 thereon. In order to mount and finally retain each die withinits seat, I provide each die with a pair of conical recesses 47 formedin the outer cylindrical surface and located closely adjacent to theradially extending faces 48 of the die. These seats are adapted toreceive each the conical point 49 of a screw 50, which is mounted Withinthe die carrier, the threaded aperture for the screw being so locatedwith reference to the conical recess 47 that the axis of the screw willbe outside of and to the rear of the axis of the recess, whereby thepoint of the screw tends to engage the rear surface of the recess 47 aswell as that portion of said aperture which is remote from the adjacentradial surface 48. A similar screw, designated by like numeral, isprovided intermediate between the pair of screws adjacent to the radialfaces 48, as will appear from Fig. 5. In this view, the manner in whichthe point of the screw coiiperates with the recess 47 will be apparent,the point of the screw shown as contacting with the rear surface only ofthe recess 47. By arranging the screws and recesses 1n the mannerdescribed, the dies Wlll be forced rearwardly and outwardly into theirseats. Furthermore, the

' dies may be very conveniently adjusted in their seats by manipulatingsaid screws.

With the parts constructed as illustrated and described, the operationwill be as follows:'lhe pin 7 will be'adjnsted by means of its inclinedsurface 9 and the screw 8. in accordance with the length of the threadto be out upon the work. When thework en- 'gages the head 10 of the pin7, whether the work be fed toward the tool or vice versa, furtherrelative longitudinal movement or the work and tool will be prevented.As 'suming that the rotation of the worker tool continues, however, theengagement of the die threads with the threads on the work will producea backward thrust -pon the pin 7 and a forward'pull upon. the die head.This will cause the head to be pulled for-- ward, compressing the spring29 between the rings 24:: and. 30 until the rear ends of the levers12lwill clear the former ring, the slots 5 permitting this relativemovement between the head and shank without destroying the drivingconnectionsecured by the pins Thereupon the springs 21 will force therearends of the levers inwardly. until they ongage the ring 32, as shownin Fig. 3. Through the sliding; connection between the heads 16 and thedie carriers, the latter will move outwardly to the position shown inFig. 3, with the cutting faces in parallel relotions. By thisconstruction, the work will be disengaged with a minimum separation ofthe die carriers and with no liability of bindin between the rearthreads of the dies and the work, This same separation of the diemembers will occur where the work does not engage the pin 7 but wherethe relative feeding movement or the work and tool is suspended withoutat the same time susp nding the relative rotary movement therebv tween.In such a case, the engagement of the threads of the dies with thethreads oil the work will result in pulling the die carriers and headforwardly and allowing the springs 21 to separate said. carriers. W henit is desired to restore the parts to their original position, it isonly necessary to rotate the ring 34 with respect to the tool to causethe rollers -13 to ride up on the hardened heads ll of the pins ll),which will cause the front ends of the levers to be rocked radiallyinwardly, moving the rear ends outwardly and out of blocking relation tothe ring 24 and allowing the spring '29 to restore the parts to theposition shown in Fig. l.

It is frequently desirable to cut a preliminary shallow thread and asecondary deeper or finishing thread on the some work. My clinstructionlends itself to this operation in a particularly convenient manner. Thering,

1' 24-, as will'appear from F 4-, is not. a true cylinder on its outersurface but is slightly deepest thread possible and that, asthe 1e versare supported on the parts of said ring, the dies will cut av shallowerthread, the shallowest thread being cut. when the levers rest uponpoints located about forty-five de press from the ends of the lines (L--64 'an'd 5-FL For the purpose of setting this ring, I provide theflange 27 with an index mark, shown at 51 and place upon the adjacentportion of ihedie head 2 marks R and S,

arranged ninety degrees apart. The mark S corresponds to the middleportion of the segment- 0 of the ring; 24 and the mark R'to the middleportion of the segment d. When the lnlQX5l is set at S, the rear ends ofthe levers will be supported on the most elevated portion of the ring 24and a standard or full-depth cut will be made. By rotating the flange(and ring 25) so as to bring; the mark 51 beyond a position halfwaybetween. S and R, the ends of the levers will be supported on a lowerpart of the ring and a thread of less depth will be out. hen the mark 51is brought into register with the letter R, the rear ends of the leversI the combination ofa shank, a rotatably adjustable collar mounted uponsaid shank, a ring carried by said collar, a die head mounted in saidshank and having an inwardly directed abutment surrounding said collarat the rear of said ring and forming a spring-receiving space with saidring, a spring in said space, levers pivoted to said head and havingtheir rear-ends normally in engagement with said ring, springs tendtoforce the rear ends of the levers inwardly, and connections betwcen thefront ends of the lovers and the die carriers, said ring being ofdifferent thicknesses from point to point.

2. ln a device of the character specified, the coinbii'iation of ashank, a ring mounted upon said shank, a die head slidably mount;- ed onsaid shank and having an inwardly directed abutment forming a sgringreceiving space with said ring, a spring in said space, levers pivotedto said head, springs tending to force the rear ends of the; leversinwardly, and connections between the front wardly beyond the firstring, an outwardly -projecting flange carried by said collar at the rearof the ring thereon, a head mounted upon the front end of the shank and.having at its rear end an inwardly or radially extending ringsurrounding said collar at the rear of the ring thereon, a springinterposed between the two last mentioned rin s, levers pivoted to saidhead and having their rear ends normally engaged by the ring on saidcollar, springs tending to force the rear ends of said levers inwardly,and die carriers connected t0 the front ends of said levers.

4. In a device of the character specified,

the combination of a shank, a ring upon said shank, a collar mountedupon said shank at the rearof said ring and adapted to abut against thesame, a ring threaded upon said collar and projecting outwardly beyondthe first ring, a head mounted upon the shank and having at its rear endan inwardly or radially extending ring surrounding said collar at therear of the ring thereon, a spring interposed between the two lastmentioned rings, levers pivoted to said head and having their rear endsnormally on gaged by the ring on said collar, springs tending to forcethe rear ends of said levers inwardly, and die carriers connected to thefront ends of said levers. a

5. In a device of the character specified, the combination of a headhaving radially extending guides therein, die carriers mount ed in saidguides, each carrier having inserted thereinto a pin provided witha'head having reversely inclined surfaces, a ring rotatably mounted onthe head and extending over said carriers, pins mounted in said ring andoverhanging saidcarriers, rollers on said pins, and yielding means formoving said carriers outwardly in their guides.

(3. In a device of the character specified, the combination of a headhaving radially extending guides therein, die carriers mounted in saidguides, each carrier having inserted thereinto apin provided with a headhaving an inclined surface, a ring rotatably mounted on the body andextending over said carriers, pins mounted in said ring and overhangingsaid carriers, and yielding means for moving said carriers outwardly intheir guides.

In testimony whereof, I hereunto allix my signature in the presence of.two witnesses.

cnAnLEs F. SCHULTIS. \Vitnesses:

llanonn E. SMITH, I EpnNNA N B. lVns'r.

